Mayza signed a major-league contract with the Yankees on Friday and was selected to the 26-man roster.
Mayza inked a minor-league deal with the Yankees on July 10 and has since been pitching for Triple-A Scranton/Wilkes-Barre, posting a 2.16 ERA across 8.1 innings. The left-hander shouldn't be expected to handle high-leverage work in what will be his first MLB action since being designated for assignment by the Blue Jays in late June.